Northeast that the Capitol, adjoining the Dirksen Senate Office Building, website bounded by constitution Ave., second St., first St., and also C St., N.E.1,271,030 square feet
The Hart building is the third office framework designed and built to serve the United states Senate.

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While the style of the Senate"s newest building scrupulously avoided classical ornamentation, the exterior however subtly recalls the regular rhythms and deep shadows that columnar buildings. It to be intended to be a graceful background building that, despite its size, would call tiny attention come itself. ~ above the within the architects controlled to balance the desire because that modesty through the should use permanent and therefore costly products — greatly marble and bronze. The main atrium gives a gathering and organizing space, and gives within offices access to abundant organic light.

The structure added much more than a million square feet to the Senate"s list of office and also support space. There are 50 suites, which range in dimension from 4,000 to 6,000 square feet. A publicly hearing room was fitted for the electronic and also written press, while facilities for food service, parking, physical fitness, police, mail, and also maintenance were additionally provided.

The many novel aspect of the plan was its flexible offices. All the older office buildings provided offices in rooms strung along one side of a corridor, putting a considerable distance between staff members. Because that the Hart Building, the architect devised a totally brand-new scheme. Every suite would occupy an envelope of space on two floors. The senator"s personal office would have actually a ceiling elevation of 16 feet, and also staff areas with ceilings eight and a half feet high would certainly be grouped roughly it. In ~ the staff space, partitions could be rearranged everywhere along a five-foot grid. Each office might be to adjust out v ease follow to the monitoring practices that an separation, personal, instance senator.

The Mountains and Clouds sculpture by Alexander Calder, creator of the mobile, was set up in the building"s atrium in 1986. The matte black color aluminum clouds, the largest of which weighs one ton, to be suspended indigenous the roof, revolving above the 39-ton stole mountains.

The Hart building solar panel system, dedicated in 2015, is among the biggest federal systems in the Washington, D.C. Area. The system furthers the Architect the the Capitol"s ( commitment to sustainable and cost-efficient energy reduction measures.

The Senate Superintendent"s Office is responsible because that the day-to-day structural, mechanical and also domestic care of the Senate Office Buildings.

History and Construction

Earlier initiatives to provide room for the Senate had had the building of the Russell Building and the Dirksen Building. By 1967, the Senate began to experience a strain on its existing office facilities and initiated the procedure that caused the creation of the Hart Building.

In 1972, the Senate Committee on rule and management asked the Architect of the Capitol to inspection the an are occupied through senators and staff and also report top top their work environment. In the decade and a fifty percent since the Dirksen building had opened, the variety of persons working for the Senate had grown native 2,500 come 7,000.

The Senate Office building Commission authorized Architect the the Capitol George M. White to commission man Carl Warnecke & Associates to prepare studies. In addition to satisfying an are and design requirements, the architects were forced to maintain the surrounding 19th-century Belmont House.


On respectable 8, 1974, the Senate Office structure Commission and also the Senate Committee on Public functions approved a proposed nine-story "extension" come the Dirksen Senate Office Building. The style included suites for 50 senators, v over one million square feet of internal space, consisting of three floors of garage and service facilities, eight floors the offices, and also a mechanical equipment floor at the top. A main atrium provides offices and corridors through light in an energy-efficient manner. To allow flexible office an are design, Warnecke introduced a two-story "duplex suite," consisting of a Senator"s office with timeless 16-foot ceilings and also two employee levels that have the right to be quickly rearranged by the use of demountable partitions.

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The an initial construction contract was awarded on might 20, 1975, excavation started in December 1975 and also the building was called in honor of former Senator Philip A. Hart in respectable 1976. The very first occupant, majority Leader Howard H. Baker, moved right into the building in November 1982.